What is it with all these people in metal dying from heart attacks? Is this genetic or I wonder what the causes of these heart attacks are......?

Well, there are numerous possible explanations. Could be genetic, could be due to fatty plaque and then there is also the somewhat more praising explanation of excess testosterone (ever since apparently a lot of men in various countries apparently die early due to having vast amounts of testosterone in their blood and putting too much strain on the heart or something to that effect).